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June 13, 1933. G oss T I 1,913,801

IGNITION MAGNETO Filed July 0, 193 2 sh ets-sheet] 1 June 13, 1933. o 1,913,801

IGNITION MAGNETO Filed July 30, 1930 2 Sheets-Sheet 2 fnvewr: am anwafi,

fa m Patented June 13, 1933 UNITED STATES GIUSEPPE FOBBATI, 01' IONZA, ITALY, ASSIGNOB 1'0 I'ABBBIOA liTAIoIANA mum SOOIETL ANONIKA, m, ITALY PATENT OFFICE IGNITION KAGNE'IO Application filed July 80, 1980, Serial No.

This invention has for its object a circuit breaker for ignition magnetoes and it also comprises mounting and adjusting means for such breakers.

In this invention the breaker which as usually is actuated by a cam fixed to the magneto rotor, is carried by a member adjustably mounted on the magneto body to provide for adjusting both the span of contact opening and the position of said breaker with respect to such a cam and therefore the time the primary circuit is broken.

Further in this invention said breaker comprises adjusting an'd fastening means which do not include screws and other means subject to become loose, the adjusting ma-,

nipulations being thus made easy and the parts being prevented from becoming loose in' operation.

Another ob'ect of the present invention is a support an return device for the breaker movable contact which includes blade springs.

On the annexed drawings are illustrated by wa of example and on enlarged scale an embo iment of this invention, and

Figure 1 is a front view of the same the magneto body supporting it being broken away;

Figure 2 is a section on line 22 of Fig. 1, with the exception of the portion at the left side of line 2-2 in Fig. 2, said portion being a section on line 2-2' of Fig. 1;

Figure 3 is a front view of a supporting member or bridge;

Figure 4 is a section on line 4-4 of Figure 3;

Figure 5 is a perspective view of a separate member;

Figure 6 is a perspective view of another separate member in disassembled position with respect to member shown in Figure 5.

Figure 7 is a perspective view of a separate member.

In the illustrated embodiment, a passage 2 is provided in the magneto body 1 and the rotor shaft 3 extends through said passage 2 and carries a cam 4 intended to actuate the breaker to be hereinafter described; said 471,882, and in ma September a, 1m.

assage 2 is encircled by an outwardly proectin flange 5.

On ody 1 a bridge 6 is secured b means of split ex anding pins 7 which are astened on said bridge 6 and frictionally engage in- A plate 12 is mounted on bridge 6 by means of an adjusting and locking device hereinafter described; said plate 12 extends at both sides of collar 6' and has end enlargements 13-14 providing notches 15 in phich are engaged the ends of blade springs A blade spring 17 is mounted on top face of enlargements 1314 and said blade spring 17 provides in its intermediate portion a stirrup 18 having lugs 19 which embrace springs 16.

Said stirrup 18 carries a movable contact 20 of the breaker and a spring 21 is located above spring 17, said spring 17 having one end secured on enlargement 13 by means of a rivet 22 while its opposite end is slidably engaged on a top ridge or knife edge 55 of enlargement 14 by means of a slot 24 of said sprin 17 and a headed rivet 23 whose stem exten s through said slot; down-turned lugs 54 engage springs 17 and 21 with each other in transverse direction.

sprin 21 has a boss 25 intermediate its ends sai boss being actuated by cam 40f the magneto rotor.

A plate 29 is fastened on supporting plate 12 by means of rivets 26 and insulating sleeves 27 and 28, said plate 29 having an U-shaped recess 30 which embraces flange 5; plate 29 provides a tongue 31 which extends transversely into stirrup 18 and carries the stationary contact 32 of the breaker (Fig. 7).

Balls 33 are rotatably engaged in.plate 29 and blade springs 34 mounted to swing on body 1 by means of pins 35 engage said KAGNETI lying in different planes (Figures 3 and p 4 .7

. parts carried thereby is free to move in any the direction on body'l with respect to flange 5 and therefore to axis of cam 4, and said contact 32 is connected with the metal body 1 b plate 29 which carries it and bears on bod 1; on the contrary the contact 20 carrie by spring member 17-18 is insulated from body 1 because plate 12 which carries said springs 1718 is insulated from earthed plate 29 at 27 and 28 and the bridge6 is likewise insulated from body 1 by insulating sleeves 8; bridge 6 is also connected by a conductor, not shown, with the insulated end of primary circuit of the armature winding of magneto, said conductor leading to one 0 seats 8 of pins 7. 7 By angularly shifting the unit 12, 29, 17, 18, 21, 26 around axis of shaft 3 andcam 4, the oint of cam revolution in which one of sses of the cam may act on boss 25 of spring 21 and therefore the timing of the circuit breakage may be adjusted; on the contrary, by removing or approaching said unit with respect to axis of shaft 3 the span of removal of contacts 20 and 32 from each other may be adjusted.

Unit 19, 29 is adjusted and locked in any selected position by means of hereinafter described device.

In a cylindrical seat 36 of plate 12 is mounted a knob 37 (Fi res 1, 2 and 5) which has a cylindrical ore 38 concentric with its cylindrical rims 39 by means of which it is mounted to rotate within seat 36; said knob 37 has also an extension 40 eccentric to bore 38' and entering slot 11 of collar 6 of bridge 6; knob 37 has notches 41 in its mm which are intended for manipulation of the same by .a wrench, and it has radial Wedge-sha ed front recesses 42.

Within ore 38 of knob 37 a cylindrical stem 43 of a second knob 44 is seated, and

. said knob 44 has an eccentric portion 45 at one end while its opposite end provides front and radial wedge-shaped notches 46 as well as recesses 47 for its engagement and manipulation by means of a wrench; knob 44 has further a central bore 48 concentric with the cylindrical surface of its stem 43.

I To assemble the device, knob 44 is inserted into knob 37 and the joint knobs 44 and 37 are inserted into cylindrical seat 36 of plate 42 within which lie cylindrical and concentric portions 39 and 43 While eccentric portions 45 and 40 extend therefrom they engagin respectively slots 10 and 11 of collar 6 0 bridge 6.

The interconnection is secured by means of a stud 49 which is inserted into central bore 48 of internal knob 44 and has its head 49. abutting against rear face of bridge 6; on the opposite end of said stud a cup shaped collar 50 is located which enters the front recess 51- of knob 44 and is engaged in position by means of split washer 52. Sai washer 52. is engaged in groove 53 of stud 49 and is clamped in cup-shaped collar 50 by a spring 54 located within the central bore 55 of knob 44 and. encircling stud 49.

In operation, when shaft 3 and cam 4 are in revolution, said cam 4 acts by its bosses on bow 25 of spring 21 and depresses said spring 21 and spring 17 with stirrup 18 and motor le contact piece 20; thus contact 20 is intermittentl removed from contact 32 and therefore primary circuit is intermittently broken, said circuit/closing on metal mass from bridge 6, plate 12, spring 1718, contact 20, contact 32, plates 21, 29'and then on metal mass; when cam 4 releases boss 25, springs 17 and 21 carry contacts 20 and 32 again into engagement with each other, by the cooperation of return springs 16.

To adjust the span of removal of contacts 20 and 32, the distance of boss 25 from spring 21 which actuates the movable contact 20 is adjusted with respect to axis of shaft 3 and cam 4, the extent of cooperation of bosses of cam 4 with boss 25 being thus adjusted.

For such a purpose knob 37 is held stationary byenga ing recesses 41 thereof by means of a suita 1e wrench, and knob 44 is moved angularly grasping its recessed portions 47; owing to wedge-shape of interengaged notches 42 and 46 by such a manipulation knob 44 is firstly withdrawn and released from knob 37 against action of spring 54 and then said knob is rotated within bore 38 concentric with knob 49 and its seat 36; by thisangular motion eccentric portion'45 of knob 44 rotates within slot 10 of stationary collar 6' (said collar being integral with bridge 6 as shown in Figs. 1 and 3) and therefore stem 43, stud 49, knob 37, plate 12 and plate 29 are shifted transverse to long horizontal axis of slot 10 the boss 25 being therefore shifted with respect to axis of shaft 3 and cam 4. 7

Such a displacement is provided for by the fact that eccentric 40 slides without angular motion along-elongatedslot 11 which is transverse to slot 10 while balls 33 of plate 29 roll under springs 34; further the displacement of the whole is guided b faces of the recess 30 of plate 29 which sli e over stationary flange 5. On knob 44 being released, it is restored by spring 54 with its notches 46 into engagement with notches 42 of knob 37 and the whole is immediately locked in position because knobs 37 and 44 are restricted from rotation when they are interlocked owing to engagement of their eccentrics 40 and 45 within slots 11 and 10 which are perpendicular to each other.

The adjustment of ignition point with respect to rotation of magneto rotor is secured by altering the angular position of boss 25 around the axis of cam 4. For this purpose knob 44 is held stationary and knob 37 is rotated by actin thereon b means of its notches 41; then rstly the mob 44 is moved back and front teeth or notches 42 and 46 are released from each other,and then knob 37 is rotated within its cylindrical seat 36 and over the cylindrical'stud 43, while the reaction of eccentric 40 on surfaces confining slot 11 causes the unit to be bodily shifted in a transverse directionwhile eccentric 45 slides without rotating within slot 10 and balls 33 ride under springs 34.

The described manipulation causes plates 12 and 29 and parts carried thereby to rotate around flange 5 embraced by sides of U-recess 30 of plate 29. Then spring 54 again clamps knobs 37 and 44 with each other and locks the whole unit in position.

Owing to above described mounting the whole circuit-breaking unit may be taken off from the magneto by shifting springs 34 apart and withdrawing bridge 6 with its pins 7 from seats 8 provided therefor in the magneto body; the said unit is restored in position by a reverse operation without any electrical connection having to be removed or made.

What I claim as my invention and desire to secure by United States Letters Patent 1s:-

1. A circuit breaking device actuated by a cam for ignition magnetoes comprising a support mounted ona magneto body for transverse and angular adjustment, means for locking said support in position, a contact stationary on said support, a spring member supported on said support, a movable contact on said spring in register with said stationary contact, means for inserting said contacts in circuit, and a second spring mounted on said support adjacent to said contact carrying spring the said second spring receiving the actuation of said cam and imparting it to said contact carrying spring.

2. circuit breaking device actuated by a cam for ignition magnetoes comprising a support mounted on magneto body for transverse and angular adjustment, means for locking said support in position, a lug extending from said support and a contact on said lug, a blade spring having its ends supported on said support and providing a band embracing said support lug, a contact on said spring bend for cooperation with first named contact, means for inserting said contacts in circuit and means for imparting the actuation of said cam to said spring.

3. A circuit breaking device actuated by a cam for ignition magnetoes comprising a support mounted on magneto body for transverse and angular adjustment, means for locking said support in position, a lug extending from said support and a contact on said lug, a blade spring having its ends sup orted on said support and providing a ben embracing said support lug, av contact on said spring bend for cooperation with first named contact, means for inserting said contacts in circuit and a second spring supported on said support adjacent to said contact carrying spring said second spring receiving the actuation of said cam and imparting it to said contact carrying spring.

- 4. A circuit breaking device actuated by a cam for ignition magnetoes comprising a support mounted on magneto body for transverse and angular adjustment, means for locking said su port in position, a lug extending from sai support and a contact on said lug, a blade spring having its ends supported on said support and providing a bend embracing said support lug, a contact on said spring bend for cooperation with first named contact, means for inserting said contacts in circuit, and a second spring having its ends supported on said support and an intermediate boss for actuation by said cam, said second spring lying adjacent to said contact carrying spring and imparting thereto the actuation of said cam.

5. A circuit breaking device actuated by a cam for ignition magnetoes comprising a U-shaped support adjustably mounted on magneto body, a stationary guide collar embraced by said U-shaped support and concentric with said cam, means for locking said U-shaped support in position, a pair of cooperating contacts'on said U-shaped support, one of said contacts being under the action of said cam, and means for inserting said contacts in circuit.

6. A circuit breaking device actuated by a cam for ignition magnetoes comprising a U-shaped support adjustably mounted on the magneto body, a stationary guide collar embraced by said U-shaped support and concentric with said cam, means for locking said U-shaped support in position, astationary contact on said U-shaped support, a blade spring extending across said U-shaped support and having its ends supported on its side portions, a contact carried by said blade spring for cooperation with said stationary contact, means for inserting said contacts in circuit, and means for imparting the actuation of said cam to said contact carrying spring.

7. A circuit breaking device actuated by a cam for ignition magnetoes comprising a U-shaped support adjustably mounted on magneto body, a stationary guide collar embraced bysaid U-shaped support and concentric with said cam means for locking said U-shaped support in position, a stationary contact, on said U-shaped support, a blade spring extending across said U-shaped support and having its ends supported on its side portions, a contact carried b said blade spring for cooperation with said stationary contact, means for lnserting said contacts in circuit, and a second blade spring having its ends supported on side portions of said U-shaped support and an intermediate boss for actuation by said cam, said second spring lying adjacent to said contact carrying spring and imparting thereto the actuation of said cam.

8. A circuit breaking device actuated by a cam for ignition ma netoes comprising a bridge secured on and insulated from the magneto body, a support adjustably mounted on said bridge for transverse and angular adjustment, means for locking said support in position, a part carried by and insulated from said support and contacting with magneto body, removable springs forcing said part on magneto body, a contact on said part and a cooperating contact on said support, one of said contacts being under the action of said cam.

9. A circuit breaking device actuated by a cam for ignition magnetoes com rising a bridge secured on and insulated rom the magneto body, a su port adjustably mounted on said bridge or transverse and angular adjustment, means for locking said support in position, a part carried y and insulated from said support and contacting with magneto body, antifriction members on said part, removable springs engaging said antifriction members to force said part on magneto body, a contact on said part and a cooperating contact on said support, one of said contacts being under the actlon of said cam. 1

10. A circuit breaking device actuated by a cam for ignition magnetoes comprising a stationary part, a support having a seat, a

pair of cooperating contacts on said sup-' port, one of said contacts being under the action of said cam, means for inserting said contacts in circuit, a sleeve rotatable in said support seat and having an eccentric portion engaged in a slot of said stationary part, a bored stud rotatable in said sleeve and having an eccentric portion engaged in a slot of said stationary part offset from and perpendicular to first named slot, a pin extending through said bored stud and having a head abutting on said stationary part, interengaging means on said sleeve and bored stud, a removable head on the end of said pin, and a spring abutting on said bored stud and removable head to hold said interengaging means in locked condition.

11. A circuit breaking device actuated by a cam for ignition magnetoes comprising astationary part, a support having a seat, a pair of cooperating contacts on said support, one of said contacts being under the action of said cam, means for inserting said conextending through said bored stud and hav-' ing a grooved free end and a head abutting on said stationary art, interengaging means on said sleeve and ored stud, a recessed removable head on the end of said pin, a-

sprin abutting on said bored stud and remova le head to hold said interengaging means in locked condition, and a split washer entering said recessed removable head and on aging said end groove of said pin.

n testimony whereof I have signed my name to this specification.

GIUSEPPE FOSSATI. 

